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2. In the May chapter this pair of alternatives was investigated and the result was that between Gb4-8 and Gb7-25 both readings could be 'intertwined', with the central point between the end of line b5 and the beginning of line b6:

48
Gb4-8 (329) Gb5-24 (378) Gb5-25 Gb5-26 Gb5-27
Gb5-28 (382) Gb5-29
February 23 (54) February 24
Terminalia Bissextum
48
Gb6-1 (384) Gb6-2 Gb6-3 Gb6-4 Gb7-25 (436)

Mauga in Gb5-28 fits well with the date Terminalia of the Julian calendar, and the fraction of a glyph in Gb5-29 could represent the leap day Bissextum. The old Roman calendar ended with February 23.

Furthermore, 13 * 29½ = 383½ and if we count the glyph number of Gb5-29 from Gb8-30, then the end of 13 lunar synodic months will be between Gb5-29 and Gb6-1. And, remarkably, in rongorongo times the Castor star culminated in February 23:

 

365 days

 

(80 + RA / 24h * 365¼)

 

Day of culmination

 

Atlas

May 16 (136)

228

December 31 (365)

135

 

11

-2

 9

+2

Aldebaran

May 28 (148)

226

January 10 (375)

137

 

44

-1

43

+1

Castor

July 12 (193)

225

February 23 (419)

138

193 + 226 = 419 = 365 + 31 (January) + 23 (February). Castor could therefore have been regarded as a personification of the old year which expired in February 23. There is no other glyph in the G text which is 'truncated' like Gb5-29 and I will therefore assume the date at Gb5-28 is February 23.

Given this interpretation we can then deduce that Rogo in Gb6-26 (409) ought to be in Gregorian day 419 (February 23) + (409 - 382) = 446 = 365 + 81. Or - better - if we should locate the fraction ¼ (= 365¼ - 365) to Gb5-29 we will have Rogo in day 26 counted from Gb6-1.

There are 28 (b6) + 31 (b7) + 30 (b8) = 89 glyphs from Gb6-1 to the end of side b. The beginning of side a is - if I have located the right ascension days for Aldebaran and Antares correctly in the text - in May 25 (where 52 * 5 = 260 = 13 * 20). This is 65 (= 13 * 5) days after March 21. And 89 - 25 = 64.

Accordingly Rogo in Gb6-26 should be in Gregorian day 145 (May 25) - 64 = 81. However, if we should count Gb8-30 twice (in order to reach 16 * 29½ = 472 for the whole text), then Rogo will be in day 144 (May 24) - 64 = 80 (March 21, 0h):

61
Gb6-25 Gb6-26 (*0) Gb6-27 Gb6-28 (411)
   Caph, Sirrah (0.5)   Algenib Pegasi (1.8)  
20 March 21 = 0h 22 23 (82) 61
Saad Al Saud 10 11 (309)  12 13
Gb8-30 (1) Ga1-1 Ga1-2 Ga1-3 Ga1-4 (*68) Ga1-5
Hyadum II (64.2)   Ain, θ¹ Tauri, θ² Tauri (65.7)   Aldebaran (68.2), Theemin (68.5)  
'24 (144) May 25 (145) 26 27 28 29
8 Sheratan 9 10 11 12 13

The other alternative, viz. to count forward from the beginning of side a to the end of side b results in a different set of stars and dates. Kava in Gb5-25 (where 52 * 5 = 260) will now be in right ascension day 379 + 63 (Gb8-30 should not be counted twice more than once) = 442 = 365 + 77, i.e. in June 6 (where 157 = 314 /2):

48
Gb4-8 (*392) Gb5-24 (378) Gb5-25 Gb5-26 Gb5-27
Polaris, Baten Kaitos (26.6), Metallah (26.9), Segin, Mesarthim (27.2), Sheratan (27.4)  Haedus II (75.9), ε Leporis (76.0), Cursa (76.4) λ Eridani (76.7) μ Leporis, (77.6), ĸ Leporis (78.0), Rigel (78.1), Capella (78.4)  
April 17 (107) 48 5h (76.1) June 6 (157) 7 8
Almuqaddam 11 (335) 49 Pleione 6 (20) 7 8 9
Gb5-28 (382) Gb5-29 (*81)
λ Leporis (79.6) Bellatrix, Saif al Jabbar (80.7), Alkab (80.9)
June 9 (160) 10
Pleione 10 (24) 11
48
Gb6-1 (384) Gb6-2 Gb6-3 Gb6-4 Gb7-25 (436)
Nihal (81.7), Mintaka (82.4)  ε Columbae (82.6), Arneb (83.0), φ¹ Orionis (83.1), Heka (83.2), Hatysa (83.5) φ² Orionis (83.6), Alnilam (83.7), Heavenly Gate (84.0) Alnitak, Phakt (Phaet), (84.7) ζ Hydrae (134.1)
June 11 12 13 14 (165) 48 August 2 (214)
Pleione 12 13 Albatain 1 (28) 2 Alhena 12 (78)

... This reading cannot be ruled out, with λ Eridani rising just above Rigel as if to announce the arrival of the great King Orion:

The distance between these alternative readings of the text is 7h (107 days). 329 (Gb4-8) + 107 = 436 (Gb7-25).

Gb6-17 (400) Gb6-18 Gb6-19 Gb6-20 (*101)
  ν Puppis (99.2), ψ3 Aurigae (99.4), ψ2 Aurigae (99.5) ψ4 Aurigae (100.5) Mebsuta (100.7), Sirius (101.2), ψ5 Aurigae (101.4)
June 27 28 29 (180) 30
Al Tuwaibe' 2 3 4 5 (45)
Gb6-21 (404) Gb6-22 Gb6-23 Gb6-24
ν Gemini (101.6), ψ6 Aurigae (101.7), τ Puppis (102.2), ψ7 Aurigae (102.4) ψ8 Aurigae (103.2) Alhena (103.7), ψ9 Aurigae (103.9) Adara (104.8), ω Gemini (105.4)
July 1 2 3 4 (185)
Al Tuwaibe' 6 7 8 9 (49)
Gb6-25 (408) Gb6-26 (*107) Gb6-27 Gb6-28
Alzirr (105.7), Muliphein (105.8) Wezen (107.1)    
July 5 7h (106.5) 7 8
Al Tuwaibe' 10 11 12 (52) 13

The distance from June 30 (the heliacal rising of Sirius) to March 15 (74) is 365 - 181 + 74 = 258 = 365 - 107.